Hi everyone, 

Sometimes we are curious and want to know about UTXOs in other wallets. 
Payjoin allows you to do this and the recipient would never doubt it 
because it's a privacy tool. It's possible to find UTXO in recipient's 
wallet without sending any bitcoin. It's called UTXO probing attack and 
described in BIP 77-78.

I have shared a demo with all the details in this [post][0]. I have used 
bullbitcoin wallet for testing this because it was the only [wallet][1] 
which supports payjoin v2 (send, receive) and testnet3.

I think users should be aware of this tradeoff and the information they 
share with the sender in payjoin. Payjoin should only be used with trusted 
senders.

[0]: https://uncensoredtech.substack.com/p/utxo-probing-attack-using-payjoin
[1]: https://en.bitcoin.it/wiki/PayJoin_adoption

/dev/fd0
floppy disk guy

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